Rotating steam boiler



July 28, 1931. J. v. BLOMQUIST ROTATI'NG STEAM BOILER 3 SheetS -Sheet l five 7 tor:-

Filed Nov. 24, 1930 t m w M2 2% M/ .fi j

J. v. BLOMQUIST ROTATING STEAM BOILER Filed Nov. 24,' 1950 July 28, 1931.

' s Sheets-Sheet 2 Patented 28, 1931 UNITED" STATES PATENT o FrcE JOHAN 'VIKTOR BLOMQ'UIST, OF STOCKHOLM, SWEDEN, ASSIGNOR ,TO AKTIEBGIiAGET V ATMOS, OF STOCKHOLM, SWEDEN, A CORPORATION OF: SWEDEN, AND 'SOCIETE ALSACIENNE "DE 'CONSTRUCTIONS MECANIQUES, OF MULHOUSE, FRANCE, A COR- PORATION OF FRANCE ROTATING STEAM BOILER A plication filed November 24, 1930, Serial'No. 497,866Qand in Germany December 18, 1929.

The 'U. S. .patent application Ser. No. 252,332, "filed .Feb. 6th, 1928, describes a slowly'rotating steam-boiler, in which the generationof the steam takes place within a plurality of straight-lined tubes rotatably mounted around acentral container communicating with said tubes, and for the purpose ofpreventing the water from being driven completely out from the tubes, when the latter move above the water level in the central container during the rotation, the tubes are connected with the container by pipes which are throttled one way or the other, or provided with overflow inlets or similar means.

According to the construction of the steam generators of this type as hitherto employed, the firing must be performed beneath the rotor member formed by the aforesaid steam generating tubes and central container, and therefore the generator plant requires a fire place surrounded by brickwork. As this brickwork will be subjected to the radiant heat from the fire, it will rather easily be damaged.

According to the present invention this inconvenience is eliminated, in that the central container in its direction of length is made so short that it will be sufficient to support the same at its one end only. Thereby the bearing means at the opposite end may be dispensed with, and the steam generating tubes at this end supported by an annular end plate preferably resting on rolls and forming a central aperture for feeding in the fuel, either in powder form or otherwise, into the interior of the squirrel-cage shaped rotor structure formed by the steam generating tubes together with the end members of the boiler. Consequently, the interior of the rotor structure will form the fireplace in the steam boiler, and in a construction of this kind the brickwork forming part of the plant will not be directly subjected to the radiant j heat from the fire. Therefore the air needed for the combustion may also be pre-heated in a very high degree, which circumstance involves a very great advantage as far as the firing of steam boilers is concerned, as well known to those skilled in the art.

Vhen using fuel in the shape of lumps or pieces, the steam generating tubes may be provided with reinforcements in such aman ncrthat no special grateconstruction is required, in that the tubes form themselves the grate needed for the firing.

The invention is illustrated in theaccompanying diagrammatical drawings, wherein Fig. 1 shows an embodimentof the invention in longitudinal section, and

Fig. 2 shows a cross section of the same seen in the direction of the fuel feed end.

Figs. 8 and 4 in the same manner asFig. 2

grate tion tapering towards oneend of the. boiler.- At theirone end, the tubes 5 are supported in bores, or other apertures, in an end plate 6 which is annular and provided with a'cenw trail aperture7, by means of which the-lfuelz is fed in'into fireplace 8 formed withinthe;

squirrel-cage shaped rotor construction. The

plate 6 is provided with a central-end boss surrounding the aperture 7 and forming a pivot for thefirotor at this end,the said bossv being provided. with a bearing race 11 rest ing on two or more rolls 10.

At itsother end the complete rotor construction is supported by a bearing 9,-which according to the drawings is supposed to be a combined supporting and thrust bearing.

During the steam generation, the rotor structureiskept in a slow continuous rotation, for-instance by :means of a belt pulley 18, so thatztlie' water athand inthe central container 20, connected with the steamgen eratingwtubes by, means of .the overflow ,pipes 21"for permittingthe escape of the steam,

fil

does not take part in the rotation and is not subjected to any substantial centrifugal action but will maintain its free level in a substantial horizontal position.

When using'a fuel in the shape of lumps or pieces, the fuel is fed in by means of a feed I worm conveyor or the like (not shown) from a hopper 12 into the fire place. In order in such case to give the tubes 5 a suflicient strength for supporting the fuel, they are exteriorly interconnected by means of a number of iron straps 13 positioned in a suitable interspaced relation. On account of the rotating movement, the fuel is automatically distributed and caused to cover the lower tubes along their whole length. The air needed for the combustion is transmitted to the fuel through the interspaces between the tubes 5, and the combustion gases escape through the interspaces between the tubes not covered by the fuel.

Another construction for reinforcement of the tubes 5 is shown in Fig. 3. According to this figure, the tubes 5 are interconnected sub' stantially to their whole length by means of longitudinal bars 14 secured by means, for instance, of welding, and provided with holes 15 distributed along the length of the bars and serving for admittance of the combustion air and escape of the combustion gases in a manner easily to be understood without specific explanation.

If the tubes 5 are surrounded by iron straps 13 as described above, a rather substantial leakage or free space will be at hand between the tubes and the brickwork in the places adjacent to the brick work between the iron straps, and thereby a portion of the air Wlll unnecessarily pass by the rotor structure and cool the combustion gases. In order to reduce this leakage to a minimum, the tubes 5 may be provided with longitudinal and outwardly extending flanges 16 as indicated in Figs. 4 and 5. Hereby the iron straps 13 are suitably provided withrecesses 17 in which the ends of the flange pieces 16 are inserted, so that one or both ends of the latter is freely supportedby the iron straps .TO those skilled in the m, a will be apparent that atemperature as high as up to 500 C. on the combustion air is permissible 2. In a slowly rotating steam boiler a'ccording to claim 1, the additional feature that the end plate provided with the c'entralopiem ing is connected with a tubular boss serving as a pivot for the boiler at the adjacent end thereof. 7

3. In a slowly rotating steam boiler according to claim 1, the additional feature that the steam generating tubes are interconnect-. ed by reinforcement means forming openings for the passage of a1r and gases through the interspace between the tubes.

In testimony whereof I have signed my.

name to this specification.

JOHAN VIKTOR BLOMQUIST.

venting a complete return of the water from I the generating tubes to the central contain er through the communication means posiv 

